Safety-lock.



A. ZAMBELLA.

SAFETY LOCK.

APPLICATION FILED JULY 17,. I916.

1,236,810. Patented Aug. 14, 1917.

gvwwzfoz Med Zamallw a ike: 11 c I UNITED STATES PATENT OFFICE.

ANDREA ZAMBELLA, OF BOSTON, MASSACHUSETTS.

SAFETY-LOCK.

Application filed July 17, 1916.

To all whom it may concern:

Be it known that I. Axnunn ZAMBELLA, a subject of the King of Italy, and a resident of Boston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Spring-Locks, of which the following is a specification, reference being had to the accompanying drawings.

T his invention relates to certain novel improvements in spring door locks and the primary object of my invention is to provide a spring door lock of a simple construction so arranged as to be readily manipulated from within by means of an operating button but which in order to be unlocked from the outside requires a specially constructed key at the end of which is secured a link, thus providing a safety look almost impos sible to pick.

lVith these and other objects in view the present invention consists in the combination and arrangement of parts as will be hereinafter more fully described and finally pointed out in the appended claims, it being further understood that changes in the specific structure shown and described may be made within the scope of the claims without departing from the spirit of the invention.

In the accompanying drawings forming a part of this specification and in which like numerals of reference indicate similar parts in the several views Figure 1 shows a face view of a lock constructed according to my invention.

Fig. 2 shows a plan view partly in section with the outer face or top of the housing removed.

Fig. 3 shows a longitudinal sectional view disclosing the key link in position.

Fig. 4; is a transverse sectional view of the instrumentalities as shown in Fig. 3.

Fig. 5 is a transverse sectional view through the lock disclosing the key link in position and engaging the laterally ex tending shoulder.

In my present invention, I provide a spring lock which is noticeable because of its extreme simplicity'and which includes a specially constructed key at the end of which is carried a link, this link after entering the lock being deflected to actuate the spring bolt.

In the drawings, a lock housing is shown comprising a 1, rear end 2; forward Specification of Letters Patent.

Patented Aug. 14, 1917.

Serial No. 109,726.

apertured end 3, having the bolt opening o, and the sides 4, 4t. This housing is provided with a number of ears a secured by means of the rivets w, as shown in Fig. 2, these ears supporting the top or outer face plate 5, as disclosed in Fig. 3.

Secured adjacent to the opening '0 is a rectangular yoke 6, and located in alinement with this yoke 6 is a block 7 having a cylindrical opening within which is slidably held the stem 9 of a rectangular bolt 8 which has the angular locking nosing 10, as is usual in lock construction.

As shown in the drawings, there is held upon the cylindrical stem 9 and interposed between the block 7 and the ends of the rectangular bolt 8, a coil spring 11. This coil spring 11 normally insures the nosing 10 being extended and projected outward in working position. The excursion of the bolt 8 is limited by means of a stud or stop bolt 12 which screws into the rectangular bolt 8 and is stopped against the yoke 6 as will be readily understood in referring to Fig. 3. Extending laterally from one side of the bolt 8 is an operating shoulder 14 which has a stem held within an opening within the bolt 8 this stem being engaged by means of a screw 13. This construction permits the shoulder 14 being removed and replaced by another shoulder so that different keys can be used in connection with these locks. Extending from the shoulder 14 and in a direction parallel to the axis of the bolt 8 is a cam 15 having the outer upper spherical face 00, this cam being gradually attenuated toward the end adjacent to the bolt. As shown in Fig. 3, this cam is of a height approximately half the width of the shoulder 14c.

Extending through a slot within the base 1 of the lock housing is an operating button 3 by means of which the bolt 8 can be manually manipulated from within. The lock described is secured to a suitable door while fastened to the jamb opposite to the door is a suitable catch as is usual in look construction, having an opening within which the nosing-10 may seat when the'door is in a closed position. I

Secured to the base 1 of'the housing are the threaded bosses Z2 into which thread suitable screws 1' holding the top or outer face plate 5 to the lock housing, this construction being shown in Fig. 1. This face plate 5 has the slot a to accommodate the stud 12.-

Located within the plate 5 at a point to one side of and above the cam 15 is an opening and surrounding this opening is a tubular key channel 5 which extends from the plates 6 as shown in Figs. 3, 4, and

This lock is intended to be countersunk within a seat in the door with the channel to receive the member 5. In order to retract the bolt 8 in the operation of unlocking the door a key must be inserted within the channel 5 provided with a means to engage the shoulder lat. In order to accom plish this, I provide a key K with a stem 20 which is slotted to receive the reduced portion (Z of the link As shown in Fig. 4:, this link 22 is pivotally held to the end of the stem 20 by means of the pin 21.

This link is of a length slightly greater than the distance between the plates 1 and 5. On being introduced into the lock the link 22 remains in alinement with the same until it turns at a certain angle to permit the lower end of the link engaging the spherical or curved face 00 of the cam 15 which results in the link being deflected at an angle to its stem, finally riding over the cam face a: and against the shoulder 1st as shown in Fig. 5, in which position, the bolt can be shoved backward in the operation of unlocking the door from without. In order to withdraw the key, the same must be turned so that the key link 22 will again drop over the curved cam face 00 so that the link 22 can be brought in alinement with the stem 20 permitting the key to be withdrawn.

The incursion of the key stem is limited by means of the shoulder as shown.

The lock is simple and inexpensive in con struetion, and both durable and efficient in operation, and can be readily attached to any door to provide a secure fastening means.

Having thus described my said invention, what I claim as new and desire to secure by U. S. Letters Patent is 1. In a spring lock and in combination, a housing having an opening within one end, of a rectangular yoke located within said housing adjacent to said opening, a block severed having a tubular channel in aline ment with said yoke, a rectangular bolt having an angular nosing extending through said opening and ending in a tubular stem slidably held within said channel, a spring upon said stem and interposed between said bolt and block to normally force said nosing outward, a stud to limit the eX cursion of said bolt said stud sliding within aslot, a shoulder laterally projecting from said bolt, a cam projecting from said shoulder having a curved outer face and being gradually attenuated toward the end adjacent to said bolt, a key, and a link pivotally secured to the lower end of said key, said link adapted to be deflected laterally on coming into contact with said cam whereby said link may be brought into engagement with said shoulder to reciprocate said bolt in releasing the bolt nosing from its catch.

2. In a spring lock and in combination, a housing, a bolt within said housing, a spring to normally force said bolt outward, a shoulder laterally extending from said bolt having a cam, means to limit the excursion of said bolt, a key, and a link secured to the lower end of said key adapted to enter said lock housing to be deflected by said cam to engage said bolt, as, and in the manner set forth.

The combination in a spring lock of the character described, of a housing, of a bolt within said housing, a spring to normally force said bolt outward, a stud limiting the excursion of said bolt, a shoulder extending laterally from said bolt, a cam having a spherical outer face secured to said shoulder and being of a width less than the width of said shoulder, a cylindrical key channel secured to said housing and ending above and adjacent to said cam, a key, and a link at the end of said key said key and link being arranged to enter said key channel said key being deflected by said cam to engage said shoulder in actuating the lock bolt.

l. The combination in a spring lock, of a housing, having an opening within one end, a rectangular bolt having a nosing extending from said opening, a spring to normally force said bolt outward, a stud to limit the excursion of said bolt, a shoulder laterally extending from said bolt, a cam projecting from said shoulder having a spherical outer face and being gradually attenuated toward the end adjacent to said bolt, a key channel secured to said housing, an operating button extending from said bolt opposite to said key channel, a key, and a link pivotally secured to the lower end of said key said link adapted to be deflected by said cam to engage said shoulder, as, and for the purpose set forth.

In testimony, whereof, I aflix my signature in the presence of two witnesses.

ANDREA ZAMBELLA.

Vitnesses JOHN IV. PARKER, MIRAN SEVASTU.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

